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fix(content): tighten safety guidance
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@@ -42,8 +42,13 @@ $ docker system prune
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```
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如果你只是想 “恢复出厂设置”,在 Docker Desktop 里也提供了相应入口。
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只有在确认要丢弃本机全部镜像、容器、卷和构建缓存,并且已经停止 Docker 服务、完成备份或导出后,才考虑删除 Docker 数据目录:
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```bash
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$ sudo systemctl stop docker containerd
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$ sudo cp -a /var/lib/docker /var/lib/docker.backup
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$ sudo rm -rf /var/lib/docker
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$ sudo systemctl start docker
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```
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### 常见故障排查
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